Yes, only if you are the sole occupant of your office (in other words, you are the only faculty member assigned to your office) may you ban concealed carry in your office by oral notification. This is the only legally effective way to do so.
You may orally notify students in your class or learning environment in a variety of ways. For example, you can make an announcement on the first day of class. If any students are not present for that class, or if you have students who join the class later, you must provide the same notice to them.
Given the movement of students in and out of classes during the first few weeks, you may wish to have your students sign a statement that acknowledges that they have received oral notification of your desire to ban guns in your office. We realize each class and faculty member presents a different situation, so implement oral notification in the way that works best for you. If you are having trouble deciding how to best implement in a legally effective way, we encourage you to contact the Implementation Task Force to receive guidance.